Spark-plug



T. F. HANWA'Y.

, SPARK PLUG. APPLICATIOPFFILED MAY 12, 1911.

Patented Mar 23,1920. I

srnnnrrine.

menses.

To all whom it may concern:

'llSGflll Improvement in SparkrPlngs, of

Belt known that l, THOMAS E. ldnnwiir, a citizen of the United States, residin at of Illinois, have invented a certain new and which the following isa specification.

This invention relates to spark plugs for interned combustion engines, and has for its object to provide a new and improved device of this description.

The invention is illustrated in the eccon'n panying drawings, wherein- Figure 1 is n sectional view showing a. spark plug embodying the invention;

Fig. Q is a plan view clone of the electrodes before being; bent into. form. V

Fig. 3 is a side view or the electrode shown in Fig. 2 after being completed.

Fig. 4 is a sectional View of the lower end of the plug showing the seating groove for holding one of the electrodes.

Like numerals refer to like parts throughout the several figures.

in carrying out my invention I provide a body portion or shell 1 of the plug, which is ofmetel and to which one of the electrodes is connected, the body portion being threaded to engage a threaded opening in the cylinder, An insulating piece or icore 2 is provided, and a metallic rod 3 extends through this insulating piece, the lower end forming; the other electrode of the plug. I prefer to split this lower end into several pieces 1-, shown. The insuletingg piece it is held in place by the not 5 which engages threadsin the body portion. 1'. The body portion is provided with it shoulder (l and the'insuleting piece has an enlargement i which engages this shoulder, and which is also engaged by the not 5. I prefer to pro vide 'washers 8 and 9 between the enlergrc ment 7 of the insulating piece and the out 5 and shoulder 6. The rod 8 is threiuled and is held in place by the port 10 and the end fittings l1 and 12. One of the electrodes is made removable without taking; the plug; apart. and consists of o ring 15 huvinp supporting arms 16 projecting therefrom and terminating in cross pieces 1'? whicl'i engage the inner well of the body portion 1. The body portion 1 is provided with longitlulinoi grooves or recesses 18 intersecting a circumferential groove or recess 19 adaq'itcd to receive these supporting arms 16 and cross 'Cliicagmin the county of Cook and tote Speclfietionot Letters lmtent. lP' tientodl ltllat. $31, llgfil dt npplicetlon died. may 1t, 1917. eerie]. no. lecithin pieces 1'? the rose pieces 17 fitting into the groove or recess 19. This removable elec trode rney be mode in any desired 111M1- ner but I preter to stamp it out out a single pieceoit mfihllli thmill then term it into the to shape illustreted inltlipgr 3 by drewinti the nietel'in'to the proper on e1 lltfwill thus be seen that by menus oft iis device one of the. electrodes may b e'sily. rind quickly placed into. position by forcing the engegto ing parts up into the body portioin seid engaging 'perts automaticallyspringing into their seating groove when they reach the proper position. lit will thus be seen. that this electrode is detocheble end is provided to with moons for eutbinetically etteching it to the body portion. llt will further be seen that this electrode can be. easily and quickly removed for cleaning purposes or for eny other purpose. lhe parts 4: form It a, plurality oi. oints tor the other electrode, and the ends ot all of them are inproriinity to the ring portion 15 of the other electrode.

@ne of the greet troubles with spark plugs is that oil, used for oiling the cylinder, gets to on the electrodes and prevents the operation of the plug". By means of my device this is entirely obviated beceuse since there ere tour centrel points on the verticelelectrode and the other electrode is circulen it will be seen that oil coming down the control electrode will not get on all the ioints and hence, one of the points will be sure to not and then et the enplosioi'i, such oil will be burned oft ll claim: i i l. A spark plug, comprising or body portion, an insulating piece d'spcsed therein, a inetal rod extending; through said insu" latinp; piece, the end thereo't tormirug; one on electrode; said body portion being provided with a circumferential internal groove ncnr the inner end thereof and with longitudt nal grooves extending from said internal I groove to the inner end of the plug, a sccloo ond electrode comprising 21. metal ring. arms connected with said ring: and iulu 'itcd to iit in said longitudinal c loves. and engaging 't ll (levicos connected mm the ends of said trode and being formed into a plurality of points, said body portion being provided with a circumferential internal groove near the inner end thereof and with longitudinal groovesextending from said internal groove to the" inner end of the plug a second electrode comprising a metal ring, arms. connecte with said ring and adapted to fit in said}! ongitudinal grooves, and engaging de- 10 vice connected w1th the ends of said arms and adapted to fit in said circumferential groove.

In testimony whereof I :illix my signature in the presence of two witnesses this 5th day of May, 1917.

THOMAS F. H ANWAY.

Witnesses:

RUTH E. M. CARLsoN, LYDIA M. SYLVANUS. 

